Mental Omega is a free unofficial expansion pack for Command & Conquer Red Alert 2 Yuri's Revenge. It started off as a balance modification created by Speeder and Mevitar and was first released in 2005. After a few years, it had grown into an unofficial sequel with new campaigns for the Allies, Soviets and Yuri. Now, version 3.3 marks the end of the long road and is the final iteration of the Mental Omega mod series.